# Z3Prover/z3

The Z3 Theorem Prover

Repository: https://github.com/Z3Prover/z3
Canonical: https://ross.abutalabs.com/products/z3
Language: C++
License: NOASSERTION
License Family: other
Last push: 2026-08-26T23:14:17+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 86, longevity 100
- inputs: {"age_days": 4178, "days_push": 7, "days_rel": 17, "gap_med": 30.5, "n_releases_24m": 17}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 12610, forks 1689 (observed 2026-08-28T04:10:59.419115+00:00)

## What it is
Z3 is a high-performance SMT (Satisfiability Modulo Theories) theorem prover from Microsoft Research, written in C++. It solves logical constraints over booleans, integers, reals, arrays, and bit-vectors, with bindings for many languages including Python, C, C++, Java, .NET, OCaml, and WebAssembly.

## Use cases
- solve SMT constraints over integers and bit-vectors
- verify program correctness with symbolic reasoning
- check satisfiability of logical formulas
- use an SMT solver from Python
- solve constraint puzzles programmatically
- integrate a theorem prover into a verification tool
- model and solve scheduling or planning constraints

## When to choose
- you need a mature, actively maintained SMT solver with multi-language bindings
- you are doing formal verification, symbolic execution, or program analysis
- you need cross-platform binaries or WASM builds

## When to avoid
- you need a lightweight dependency - Z3 is a large C++ library
- you only need simple boolean SAT solving where a smaller SAT solver suffices
- you need a pure high-level proof assistant like Coq or Lean

## Facets
- artifact type: library
- maturity: stable
- function: interpreter, math, testing, developer-tools
- domain: programming-languages, developer-tools, mathematics
- platform: windows, cross-platform, python, cpp, wasm, jvm, dotnet
- tags: smt-solver, theorem-prover, constraint-solving, formal-methods, symbolic-reasoning, satisfiability, algorithms, linux, macos

## Member repositories
- Z3Prover/z3 (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:59.419115+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:13:55.726662+00:00, confidence not recorded.
  - readme: https://github.com/Z3Prover/z3 (fetched 2026-08-28T04:10:59.419115+00:00, sha fc6477c4e2ce)
- Data as of 2026-08-30T08:39:29.467469+00:00.